Linux: Out-of-bounds Read
CVE-2026-46203 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 2e7cd62c37f51823c2bb79de1d4d76d0c1678c7e, 63a9f6012f453578898c9fcc13c8452a8651104e, d67a5311818b3e6481a1e4293c9337ebfee73111 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.13% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 2e7cd62c37f51823c2bb79de1d4d76d0c1678c7e or 63a9f6012f453578898c9fcc13c8452a8651104e or d67a5311818b3e6481a1e4293c9337ebfee73111 or 233db2cb14db8b1935dda52a6affd97276462b82, whichever matches your release line, or a later version.
- Update Linux Kernel to 7.0.9 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 0578a6dbfe7514db7134501cf93acc21cf13e479 up to, but not including, 2e7cd62c37f51823c2bb79de1d4d76d0c1678c7e; 0578a6dbfe7514db7134501cf93acc21cf13e479 up to, but not including, 63a9f6012f453578898c9fcc13c8452a8651104e; 0578a6dbfe7514db7134501cf93acc21cf13e479 up to, but not including, d67a5311818b3e6481a1e4293c9337ebfee73111; 0578a6dbfe7514db7134501cf93acc21cf13e479 up to, but not including, 233db2cb14db8b1935dda52a6affd97276462b82; 6.7 | 2e7cd62c37f51823c2bb79de1d4d76d0c1678c7e, 63a9f6012f453578898c9fcc13c8452a8651104e, d67a5311818b3e6481a1e4293c9337ebfee73111, 233db2cb14db8b1935dda52a6affd97276462b82 |
| Linux | Linux Kernel | 6.7 up to, but not including, 7.0.9; 7.1 | 7.0.9 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
Official description
In the Linux kernel, the following vulnerability has been resolved: spi: cadence-quadspi: fix unclocked access on unbind Make sure that the controller is runtime resumed before disabling it during driver unbind to avoid an unclocked register access. This issue was flagged by Sashiko when reviewing a controller deregistration fix.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Other references
Recent Out-of-bounds Read vulnerabilities
- 8.3 High severity
- 8.8 High severity
- 8.8 High severity
- 8.3 High severity
- 8.3 High severity
- 9.6 Critical severity
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